Revert of r10943.

src/core/SkDeviceLooper.cpp

-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkDeviceLooper.h"
-
-SkDeviceLooper::SkDeviceLooper(const SkBitmap& base,
-                               const SkRasterClip& rc,
-                               const SkIRect& bounds, bool aa)
-: fBaseBitmap(base)
-, fBaseRC(rc)
-, fDelta(aa ? kAA_Delta : kBW_Delta)
-{
-    SkIRect bitmapBounds = SkIRect::MakeWH(base.width(), base.height());
-    if (!fClippedBounds.intersect(bounds, bitmapBounds)) {
-        fState = kDone_State;
-    } else if (this->fitsInDelta(bounds)) {
-        fCurrBitmap = &fBaseBitmap;
-        fCurrRC = &fBaseRC;
-        fState = kSimple_State;
-    } else {
-        fCurrBitmap = &fSubsetBitmap;
-        fCurrRC = &fSubsetRC;
-        // back up by 1 DX, so that next() will put us in a correct starting
-        // position.
-        fCurrOffset.set(fClippedBounds.left() - fDelta,
-                        fClippedBounds.top());
-        fState = kComplex_State;
-    }
-}
-
-SkDeviceLooper::~SkDeviceLooper() {
-}
-
-void SkDeviceLooper::mapRect(SkRect* dst, const SkRect& src) const {
-    SkASSERT(kDone_State != fState);
-    *dst = src;
-    dst->offset(SkIntToScalar(-fCurrOffset.fX),
-                SkIntToScalar(-fCurrOffset.fY));
-}
-
-void SkDeviceLooper::mapMatrix(SkMatrix* dst, const SkMatrix& src) const {
-    SkASSERT(kDone_State != fState);
-    *dst = src;
-    dst->postTranslate(SkIntToScalar(-fCurrOffset.fX),
-                       SkIntToScalar(-fCurrOffset.fY));
-}
-
-bool SkDeviceLooper::computeCurrBitmapAndClip() {
-    SkASSERT(kComplex_State == fState);
-    
-    SkIRect r = SkIRect::MakeXYWH(fCurrOffset.x(), fCurrOffset.y(),
-                                  fDelta, fDelta);
-    if (!fBaseBitmap.extractSubset(&fSubsetBitmap, r)) {
-        fState = kDone_State;
-        return false;
-    }
-    fSubsetBitmap.lockPixels();
-    
-    fBaseRC.translate(-r.left(), -r.top(), &fSubsetRC);
-    (void)fSubsetRC.op(SkIRect::MakeWH(fDelta, fDelta), SkRegion::kIntersect_Op);
-    return true;
-}
-
-bool SkDeviceLooper::next() {
-    if (kDone_State == fState) {
-        return false;
-    }
-    
-    if (kSimple_State == fState) {
-        fCurrBitmap = &fBaseBitmap;
-        fCurrRC = &fBaseRC;
-        fCurrOffset.set(0, 0);
-        fState = kDone_State;
-        return true;
-    }
-    
-    SkASSERT(kComplex_State == fState);
-    
-    // need to propogate fCurrOffset through clippedbounds
-    // left to right, until we wrap around and move down
-    
-    if (fCurrOffset.x() + fDelta < fClippedBounds.right()) {
-        fCurrOffset.fX += fDelta;
-        return this->computeCurrBitmapAndClip();
-    }
-    fCurrOffset.fX = fClippedBounds.left();
-    if (fCurrOffset.y() + fDelta < fClippedBounds.bottom()) {
-        fCurrOffset.fY += fDelta;
-        return this->computeCurrBitmapAndClip();
-    }
-    fState = kDone_State;
-    return false;
-}